The Effect of Spontaneous Ventilation On Blood Gases in Obstetric Patients Under General Anesthesia

Foetal Hypoxia—An Anaesthetist's approach to Classification and Prevention

“…Nevertheless care is needed when efficient regional analgesia is performed after unsatisfactory use of other methods, that the residual effects of circulating analgesics do not cause undue depression of ventilation. Although Krantz et al (1973) did not record elevated PaC0 2 during spontaneous ventilation under light general anaesthesia they did not measure pre-anaesthetic PaCo 2 or Pa0 2 and it seems preferable to control ventilation in obstetric patients via an endo tracheal tube. Unexpected high subarachnoid block may produce alveolar hypoventilation by paralysis of intercostal muscles.…”